Definitions for oscillating needle
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The Standard Electrical Dictionary
Oscillating Needle
A small light bar magnet suspended by a filament and employed in determining the intensity of a magnetic field by the oscillations it completes in a given time after a given disturbance.
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"oscillating needle." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/oscillating needle>.

